Which of the following actions does NOT contribute to tire fires?

Driving slowly on a hot day does not contribute to tire fires because this action generally helps to reduce the heat generated by the tires. When vehicles travel at high speeds, especially in hot weather, the friction between the tires and the road increases significantly, which can raise the tire temperature to dangerous levels. Conversely, driving slowly minimizes this friction and heat buildup, making it less likely for a tire to catch fire.

In contrast, under-inflated tires can generate excessive heat as they flex more than properly inflated tires, making them more susceptible to failure or ignition. Bleeding the tires, which involves removing some air pressure, can also lead to increased heat accumulation, thereby creating a higher risk for fires. Overloading the trailer increases the stress and heat generated in the tires due to the additional weight, significantly raising the likelihood of a tire fire.